Liquid pump



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fn re "for:

Patented 4 Nov. 18, 193() UNITED STATES HEINRICH- BEYEB, OF FLENSBURG, GERMANY LIQUID PUMP Application filed December 20, 1928. Serial No. 327.240.

In power-driven pumps with two parallel cylinders,l the pistons of which are driven by t'cranks on the ends of a worm-wheel axle disyplaced the one to the other. The driving- 5 mechanism works freely in the pressure chamber of the pump and comes permanently in contact with the liquid to be lifted, so that it is impossible to prevent unsteady working of the pumps. l

According to the invention this inconvenience is obviated by arranging the worm and worm-wheel in the pressure chamber in a separate space packed with regard to the pressure chamber without a stuffing-box.

1 It may happen that, although the shaft extending through this space be well packed by leather cups, liquid enters the space packed against the pressure chamber' owing to wear and to the high pressure above atmospheric existing in the pressure chamber, whereby working of the worm and worm-wheel is unfavorably iniuenced and'becomes unsteady.

In order to avoid this possibility, an intermediate space is provided, according to the 5 invention, between the pressure chamber and the separate Well packed chamber, said intermediate space designed to receive the liquid pressed out of the pressure chamber, when the packing is defective. The liquid loses its pressure in this intermediate space f and can fiow out of the same through a small hole so that the liquid is prevented from flowing from this intermediate space into the separate chamber.

F or the purpose of a lubrication of' the portion of the shaft which extends through the intermediate space, a small chamber may be arranged around this portion of the shaft filled with suitable lubricating-material and having a narrow hole in the top. The inflowing liquid pushes back the lubricant, flows'through the intermediate space, where it loses its pressure, and flows then out through the hole in the bottom of the intermediate space. v

vIn the accompanying drawing a form of construction of the new arrangement is illustrated.

Fig. 1 shows in front elevation, partly in section the housing for the driving-mechanism with two piston pumps.

Fig. 42 is a top view of Fig. 1, partly in se'ction.

In the Walls of the housing a the rapidly rotating driving shaft b is so mounted that the portion of shaft b situated in the housing forms a worm d with which a worm wheel g meshes which is keyed "on a transverse shaft,b f. The separate chamber h, in which the worm d and the worm-wheel g are situated, is packed against the pressure chamber a. On each end of the transverse shaft f which projects into the pressure chamber a, a crank i is mounted the one displaced to the other, said crank driving the pistons in the cylinders Z up and down by means of connectingrods k. The well packed chamber L is iilled with non-liquid lubricating-material, and7 as no liquid can enter into the chamber t, no stuffing-boxes or similar` means are necessary on the place where the shaft f is journaled in the casing-wall. Between the discharge chamber a and the chamber k for the driving-mechanism an intermediate space 'm is formed on each side. In the walls of these chambers m -the transverse shaftf is well packed against the pressure chamber a by leather cups n ofthe like.`

The packing between pressure chamber a and chambers m might nevertheless become' defective so that liquid Hows into the chambers m. The liquid will there lose its pressure and How out of the chambers m through holes o provided in the bottom of these chambers m, so that no liquid can arrive in the chamber z, for the driving-mechanism.

The `outiowing of water to the outside from the chambers m indicates that the packing between the pressure chamber a and the chambers m is defective", so that the packing can be received or afresh packing fitted.

For the lubrication of the portions of the transverse shaft f in the casing-wall a small chamber r is arranged around this portion of the shaft. This chamber r is filled withV suitable lubricating-material and has in its top a hole u. The arrangement for the lubrication of the transverse shaft 7 has also the advantage, that, when the packingis dam- 10 aged, the liquid `must irst take its way through the chamber 1' and from here into the chamber m, where its pressure is broken and from which it flows out.

What I claim, is:

1. A power driven piston pump, comprising in combination with two parallel cylin-V ders, a housing on said cylinders, a driving shaft journaled in said housing and having a worm portion,- a piston in each cylinder, a transverse shaft in said housing above said driving shaft, a Worm wheel keyed on said transverse shaft, a crank on each end of said transverse shaft, a connecting Vrod connecting each crank with its piston, a casing in sa1d housing enclosing said Worm gear mechanism and the corresponding portions of said shafts, and a separate chamber at each side of said Acasing designed to preventV the entrance of liquid under pressure from said pressure chamber into s'aid casing.

2. A power driven piston pump as specied in claim l, comprising in combination with the. casing for the worm wheel gear and owith the two side chambers of said casing,

asmall Vcasing in each side chamber enclosing each a portion of the transverse shaft and filled with lubricant, each small casing having an inlet hole in the top plate.

In testimony whereof I have hereunto set my hand.

HEINRICH BEYER. 

